Please advise and offer some diagnostic help please!

I've built a PC tech specs as follows:

Graphics Card
Onboard graphics only

AMD Catalyst Driver Version, and Driver History
Cannot install driver, video drops out

Operating System
Win 8 SP1 / Ubuntu 12.04
- Standard installs and setup, base OS software and configuration

Issue Details
Installing AMD driver under windows 7/8 results in video dropping out. Connected to monitor with DVI-D cable. In Ubuntu, onscreen graphics is a little glitchy with unusual lines appearing across the screen randomly and occasionally. Attempt to install AMD graphics drivers for Linus results in the install freezing with just a grey box in the install screen window.

- links to videos or pictures that may demonstrate your issue

Motherboard or System Make & Model
ASRock FM2A55M-DGS Motherboard BIOS updated to latest [2.30]

Power Supply
Pulse Power 650w power supply

Display Device(s) and Connection(s) Used
Acoustic Solutions HD TV/Monitor
DVI-D connection

Applications and Games
In Ubuntu, glitches are common on screen during desktop use. In all OS's on driver installation there are problems. In windows, video is lost and only returns when rolling-back driver to standard Microsoft PNP Video Driver.

CPU Details
AMD A4-5300 APU 3,400GHz Dual Core 1.0MB Cache with integrated Radeon HD 7480D
Standard installation and setup, no overclocking. CPU core temperature holding stead in around 34 degrees centigrade.

Motherboard BIOS Version
BIOS vers 2.30 [latest] 

System Memory Type & Amount
Kingston 4GB (2x2GB) HyperX DDR3 1600MHz DIMM XMP X2 CL9 (Genesis Special Edition Grey) 
Mfr#: KHX1600C9D3X2K2/4GX

Additional Hardware

Seagate 500GB 7200rpm HDD

Zalman Z5 case with 2 fans installed

TP-Link PCI Wireless N Network card installed

Additional Details
Running solid virus prevention software, Win Defender and Spybot

Downloaded and ran check with AMD System Monitor to see performance of core CPU's and gpu. Cores showing small percentage of throughput, however gpu running flat at 0% (this in particular makes me feel the gpu may be faulty). Link to recording: http://dl.dropbox.com/u/55905389/AMDPM%209-3-2013%20184615.csv

No other hardware to swap out chips. Appart from video driver installation problem and Ubuntu screen glitches everything else seems to be running fine. Please advise any other suggestions you may have to pin-point the problem. If you have comparison tests in AMD System Monitor software, the 0% activity of my GPU could verify problem.

Try with another monitor, or check that you have set up the TV correctly for connecting PC to TV using HDMI (the mode etc.).

an Alpha Geek @ AMD Processors Forums | 01/21/2006 | post count 3217

I installed catalyst drivers successfully with vga cable, but no video on the DVI-D cable. The DVI only works when I roll back driver to standard Microsoft PnP display driver. I can't understand how it displays fine on VGA but not on DVI, the TV can handle resolutions fine on VGA, and is HD compliant.